Variable Rules

Overview

If a user wants to extract or set a custom variable, then it can be done using Variable Rules. It can be used in the following:

1. Form Validation : If a user wants a form field to be immutable, then he can create a variable for that field that is going to be immutable. This variable can be used in form validation to check whether the field is immutable or not. If the field is modified, then the request will be dropped

Note: Any parameter from the Request/Response can be stored in a variable.

Variable Rules

How to use:

1. Go to WAF > Listeners > Rules > Variable Rules

2. Create rules with different conditions and Save Changes.

PARAMETERS	ACCEPTED VALUES	DEFAULT
Rule Name	String	None
Rule Message	String	None
Rule Priority	Integer	None
Evaluation Phase	drop-down	Request
Variable	Drop-down	Blank
Mutation Action	drop-down	SET
Value	String	None

Variable Rule Condition

Description

Rule Name

Specify a user-friendly name to identify the rule. The rule name takes alpha-numeric input.

Rule Message

The user can add a short description of the rule. The description would explain the purpose of the rule.

Rule Priority

Set the priority of the rule. If two rules have the same priority, then selection will be random.

Evaluation Phase

Users can set the evaluation phase either for request coming from end users or for response sending back to end users.

Variable

User can select the variable which should be earlier created under variables.

Mutation action

Users can specify the mutation action.

Value

Users can specify the value for the rule.

Condition Phase

User can define the condition phase

Find Location

User can define the source location where this condition needs to be applied

Match condition

User can select the condition which was previously mentioned in the drop down.

Match Value

User can mention the value which should be matched.